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[JJ插地] prob/stat高手召喚
population mean 2.8mins population sd=0.8mins
there are 9 customer in the line
prob that the bank teller spends less than 2.6 minutes = 0.4013
the prob that the bank teller spends less than 2.6 minutes with exactly 3 of the 9 customers=?
there are 9 customer in the line
prob that the bank teller spends less than 2.6 minutes = 0.4013
the prob that the bank teller spends less than 2.6 minutes with exactly 3 of the 9 customers=?
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